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The problem with a method like this is as far as I know and as far as we've talked on our team, the only way to really effectively do this would be with reverse skew matrices.
Basically, in graphics, when you're generating an object, say, a square, you want to know how that object will look as the camera moves around it. To calculate this you use something called a "skew matrix" that's basically a mathematical explanation of how the object will distort as you move around it.
Unfortunately, as far as we've found, doing this backwards (what you'd need to determine position given skew of the targets) is far from easy. Hopefully someone has found a better way to do it and will let us all know here.
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